Mr Glushkov is said to have not believed his friend had taken his own life, and told the Guardian: 'Too many deaths [of Russian emigres] have been happening'.
They added there is no evidence to suggest the death is linked to the incident in Salisbury, where a former Russian spy Sergei Skripal and his daughter Yulia were poisoned with nerve agent which the United Kingdom government believes came from Russia.
Scotland Yard said in a statement: "Police were called by the London Ambulance Service at 22:46 on Monday, 12 March to reports of a man found deceased at a residential address in Clarence Avenue, New Malden".
Counter-terrorism police were leading the investigation "because of associations that the man is believed to have had".
Former Russian spy Sergei Skripal and his daughter Yulia were poisoned by a nerve agent believed to have come from Russia.
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Police did not release the man's name saying the man had not been formally identified.
Glushkov had worked for Russian airline Aeroflot and at Berezovksy's LogoVAZ vehicle company.
"The death is now being treated as an unexplained".
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Police said he killed himself, but his friends were less certain and a coroner recorded an open verdict.
Glushkov was subsequently charged with money laundering and fraud and served five years in jail in Russian Federation.
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Glushkov had said at the time that he did not believe Berezovsky died of natural causes.